I FOUND IT!!!!!!!!!!........ Started the motorhome tonight and checked the charge at both the coach & chassis batteries. Chassis charge was 14.2v and coach batteries were not charging at all and were at 12.4v. So I back traced the positive side of the coach battery an traced into the fuse/solenoid box. Found that across one of the solenoids, I had 14.2v on one side of the solenoid, and 12.4v on the other side. So I grabbed a 1/2" wrench and the nut was very loose & tightened it up and checked the all the other solenoid connections & they were all loose to one extent or another. Shut down the engine & coach voltage stayed at 13.6........my Lp gas detector was working correctly, & voltage only dropped 1/10v after having most of the interior lights on for 15 minutes, and as soon as I turned the lights off..... Voltage went right back to 13.6v.......... Thanks guys for the feedback and ideas!!!!!!! I greatly appreciate it.

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You are on it and a fast learner. Your charger/converter is just fine. You do need to plug in to shoreline for 6-8 hour or overnight if possible to let it do its job. Buy a simple hydrometer to test the batteries and a gallon of distilled water to keep them filled properly. Do the research on battery maintenance. Most batteries are murdered versus diying a natural death due to poor maintenance and charging/discharging.

Your solar panel is basically a feel good device that will keep the batteries in good voltage condition if NOTHING is drawing on them. That means completely cut off. Those tiny panels are trickle chargers.

Keep your battery terminals shiny clean and tight. You found what a simple loose nut will do. Twelve Volts just has very little push to force its way through bad connections.